3-Pin - Standard DIN Plug Connector with Metal Shell
Circular DIN Connectors - All male connectors (plugs) in this family of connectors feature a 13.2 mm diameter metal shield with a notch that limits the orientation in which plug and socket can mate. A range of connectors of the same style that differ only in their pin configuration. The plugs consist of a circular shielding metal skirt protecting a number of straight round pins.
These connectors are often found in audio, low voltage lighting, and industrial process control applications.